Marc Mc

Hello..i just bought my first Mustang and the rear end gears have been changed to a 3:73 but the speedo was never calibrated..any idea how i can go about doing this?I have access to a mazda computer which does hook up to the Mustang..i could change the tire size but not the rear end..thanks for the help

WannaBeGearHead

Speed calibrator or tuner

tws1098

You can look into a program like sniper if you plan to do further modifications and get into tuning your own car. They have a nice base package and it would allow you to calibrate the rear gear change. If you aren't looking for something that expensive or intensive, you could get a speedcal http://www.americanmuscle.com/speed-...tor-94-04.html

ChalknCover

I would recommend getting a tuner since you are just getting into this, it will help you with your future mods too if you decide to go F/I of N20. You can find them from our site sponsors. Some do free tunes for life, they just email them to you.